diff --git a/.github/workflows/format.yaml b/.github/workflows/format.yaml
index 930dc1b5..685a00c1 100644
--- a/.github/workflows/format.yaml
+++ b/.github/workflows/format.yaml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@786fff0690178f1234e4e1fe9b536e94f5433196 # v20
+        uses: DeterminateSystems/nix-installer-action@c5a866b6ab867e88becbed4467b93592bce69f8a # v21
 
       - name: Checkout
         uses: actions/checkout@v4